H - injection simulations 13th October 2014 Jose L. Abelleira, Chiara Bracco

Current issues Issue with cluster SCL6 (only PTC ORBIT) Finding way to adapt the code from ORBIT to PTC ORBIT (with help of F. Schmidt and Sarah Cousineau, ORLN) H- injection simulations2 Teapot.cc replaceTPQ(const String &n, const Integer &order, const String &et, const Real &tilt, const Real &kq, const Integer &TPsubindex, const Integer &nsteps, const Integer &fringeIN, const Integer &fringeOUT) replaceTPQ(const String &n, const Integer &order, const String &et, const Real &tilt, const Real &kq, const Integer &nsteps, const Integer &fringeIN, const Integer &fringeOUT) buildTPlattice(const String &MADTwissFile, const String &MADLATFile, const Integer &nstepTPD, const Integer &fringeD, const Integer &nstepTPM, const Integer &fringeM, const Integer &nstepTPQ, const Integer &fringeQ, const Integer &nstepTPB, const Integer &fringeB, const Integer &nstepTPS, const Integer &fringeS, const Integer &nstepTPK, const Integer &fringeK) buildTPlattice(const String &MADTwissFile, const String &MADLATFile, const Integer &nstepTPD, const Integer &nstepTPM, const Integer &fringeM, const Integer &nstepTPQ, const Integer &fringeQ, const Integer &nstepTPB, const Integer &fringeB, const Integer &nstepTPS, const Integer &nstepTPK) ORBIT version used current PTC ORBIT

Current work. assumptions H- injection simulations3 All simulations run with this foil size And taking into account a current of 26 mA at injection (from the 50 mA at the source)

status MATLAB code to simulate ideal (linear) particle evolution in the phase space to study the influence of the tune in the painting without ORBIT simulation H- injection simulations4 Define optimum KSW waveforms for ISOLDE Add aperture tolerances (± 1 mm) and check impact on losses (ISOLDE) Check if any improvement is obtained combining a horizontal offset and painting. Provide Elena with best distribution (ISOLDE) Vary bx of the initial distribution from 5.6 m to 2.5 m and see if, by varying the KSW waveform, any improvement (more uniform distribution) is achievable (ISOLDE) Vary the horizontal tune (ISOLDE):

Results : LHC beam H- injection simulations5 1.62x10 12 particles 5x10 3 macroparticles sim62 sim63 No longitudinal painting. σ  E =336 keV 10-turn injection

Results : LHC beam H- injection simulations6 sim62 sim36 Beam profile after 100 turns

Results : ISOLDE beam H- injection simulations7 Longitudinal painting 100 turns, 1.60x10 13 part 120 turns, 1.95x10 13 part 5x10 3 macroparticles Vertical offset : 10 mm I 1 =0.57*35 mm t 1 =15  s I 2 =0.50*35 mm t 2 =[100,120]  s ε x =13  m ε y = 8  m sim55 sim56 Too many losses

Results : ISOLDE beam H- injection simulations8 For 120 injected turns, compared with a full simulation with 500k macro particles sim56 sim58

Results : ISOLDE beam Influence of transverse offset -no change appreciated with 5k particles (more resolution needed) H- injection simulations9 x_offset sim59-2 sim600 sim61-2

Planing Tune study. Matlab model simulating injection for different turns. (17/10/2014) H- injection simulations10 Revise aperture and add tolerances for ISOLDE beam. (17/10/2014) Verify the previous results with 500k particles. 22/10/2014 Try with βx=5.5->2.5 (22/10/2014) With PTC- ORBIT Repeat x_offset study (22/10/2014)

Conclusions 5k macroparticles seem enough to adjust the KSW waveform, as no big effect from spacecharge on the order of injection time Still need 500k to define well the beam profile, and to verify emittances. H- injection simulations11

H- injection simulations12